Manganese hexacyanomanganate open framework as a high-capacity positive electrode material for sodium-ion batteries

被引：0

作者：

Hyun-Wook Lee

Richard Y. Wang

Mauro Pasta

Seok Woo Lee

Nian Liu

Yi Cui

机构：

[1] Stanford University,Department of Materials Science and Engineering

[2] Stanford University,Department of Chemistry

[3] Stanford Institute for Materials and Energy Science,undefined

[4] SLAC National Accelerator Laboratory,undefined

来源：

Nature Communications | / 5卷

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摘要：

Potential applications of sodium-ion batteries in grid-scale energy storage, portable electronics and electric vehicles have revitalized research interest in these batteries. However, the performance of sodium-ion electrode materials has not been competitive with that of lithium-ion electrode materials. Here we present sodium manganese hexacyanomanganate (Na2MnII[MnII(CN)6]), an open-framework crystal structure material, as a viable positive electrode for sodium-ion batteries. We demonstrate a high discharge capacity of 209 mAh g−1 at C/5 (40 mA g−1) and excellent capacity retention at high rates in a propylene carbonate electrolyte. We provide chemical and structural evidence for the unprecedented storage of 50% more sodium cations than previously thought possible during electrochemical cycling. These results represent a step forward in the development of sodium-ion batteries.

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